CN113866247B - Liquid metal oxygen measuring sensor and manufacturing method thereof - Google Patents
Liquid metal oxygen measuring sensor and manufacturing method thereof Download PDFInfo
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- CN113866247B CN113866247B CN202111142962.7A CN202111142962A CN113866247B CN 113866247 B CN113866247 B CN 113866247B CN 202111142962 A CN202111142962 A CN 202111142962A CN 113866247 B CN113866247 B CN 113866247B
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Abstract
The embodiment of the application discloses a liquid metal oxygen sensor and a manufacturing method thereof, relates to the technical field of oxygen sensors, and solves the problem that the liquid sensor is limited by a functional ceramic device structure and is difficult to prolong in the related technology. The liquid metal oxygen sensor comprises an adaptive shell, wherein a fixing part is arranged on the outer wall of the adaptive shell and used for being fixed on a container to be detected, the part, located below the fixing part, of the adaptive shell is located in the container to be detected, a functional ceramic part is fixed at the lower end of the adaptive shell, and a functional element used for detection is arranged inside the functional ceramic part. The liquid metal oxygen sensor is used for measuring the content of oxygen in liquid metal.
Description
Technical Field
The embodiment of the application relates to the field of but not limited to oxygen sensors, in particular to a liquid metal oxygen sensor and a manufacturing method thereof.
Background
Liquid Metal (LM) is often used as a coolant in the atomic energy industry, the oxygen content in the liquid metal plays an important role in the safe operation of a reactor, and too high oxygen content can cause lead bismuth oxide to be separated out, and block pipelines, valves, equipment and the like; the low oxygen content can cause the lead bismuth solution to corrode pipelines, valves, equipment and the like in the operation process. It is therefore particularly important to control the oxygen content of the liquid metal coolant, and accurate measurement of the oxygen content is a prerequisite for oxygen control.
Functional ceramic devices prepared from calcium oxide-stabilized zirconia Ceramics (CSZ), yttrium oxide-stabilized zirconia ceramics (YSZ), ytterbium oxide-stabilized zirconia ceramics (Yb-ZrO 2), scandium oxide-stabilized zirconia ceramics (Sc-ZrO 2), and the like are widely applied to the atomic energy industry. The oxygen sensor prepared by the functional ceramic device can be used for measuring the oxygen content in various nuclear reactor heat transmission loop systems using liquid metal as a coolant.
The functional ceramic part is directly sintered into an overlong shape and is difficult to form due to the problems of stress concentration and the like, so that the functional ceramic part can only be prepared into a ceramic part with a simple structure and a relatively fixed length, and a corresponding oxygen sensor is limited by the fact that the length of the functional ceramic part is difficult to adapt to containers to be measured at different depths.
Disclosure of Invention
The embodiment of the application provides liquid metal oxygen sensor, but the partial length that is located the container that awaits measuring can freely set up, and the application scene is abundant.
In a first aspect, an embodiment of the application provides a liquid metal oxygen sensor, which includes an adaptation shell, wherein a fixing portion is arranged on an outer wall of the adaptation shell, the fixing portion is used for fixing on a container to be detected, a portion of the adaptation shell located below the fixing portion is located in the container to be detected, a functional ceramic part is fixed at a lower end of the adaptation shell, and a functional element used for detection is arranged inside the functional ceramic part.
The embodiment of the application provides a liquid metal oxygen sensor, stretch into the liquid metal in the container that awaits measuring with the function ceramic spare, detect the oxygen content in the liquid metal through functional element, the function ceramic spare is because the stress concentration problem, length relatively fixed, consequently, the container that awaits measuring of the fixed degree of depth of adaptation only, through the fixed adaptation shell in function ceramic spare upper end, and it is fixed with the container that awaits measuring through the fixed part on the adaptation shell, because the length of adaptation shell can freely set up, through the adaptation shell length of position under the extension or shortening fixed part, thereby the extension or shorten the length that the sensor is located the container that awaits measuring, thereby adapt to the container that awaits measuring of the different degree of depth, compare with the scheme that sensor length is subject to the function ceramic spare among the correlation technique, the sensor of this application will freely set up the adaptation shell of length fixed with the function ceramic spare, and set up the fixed part on the adaptation shell, thereby freely change the length that the sensor is located the container that awaits measuring, the universality of this application sensor has been improved, its application scene has been enriched.
In one possible embodiment of the application, the adapter housing is soldered to the functional ceramic part.
The embodiment of the application provides a liquid metal oxygen sensor, the welding sealing performance is good, when a functional element needing to be sealed is used, excellent sealing performance can be provided, no additional part is needed, the structure is simple, and materials are saved; the welded structure has high rigidity and good integrity and is not easy to damage; meanwhile, when in brazing connection, the brazing filler metal is melted and flows through capillary force and fills the welding seam, and compared with the method for connecting the functional ceramic tube through fusion welding, the functional ceramic tube is almost free of deformation, and the structure of the functional ceramic tube is well maintained.
In a possible implementation manner of the application, the lower end of the adaptive shell is connected with a protective cover, the protective cover is sleeved on the outer side of the functional ceramic part, and a through hole is formed in the position, relative to the functional element, of the protective cover.
The embodiment of the application provides a liquid metal oxygen sensor, contact between a functional ceramic piece and liquid metal is guaranteed through the arrangement of the through holes, so that the detection of the sensor is not influenced by a protective cover, the functional ceramic piece is prevented from directly colliding with the outside due to the arrangement of the protective cover, and the risk of damage of the functional ceramic piece is reduced in the processes of storage, transportation and use; meanwhile, in the installation process of the sensor, the installation can be rapidly and safely completed due to the protection of the protective cover, and the functional ceramic part does not need to be collided with the measured container, so that the installation efficiency of the sensor is effectively improved; in addition, even if the functional ceramic part is damaged due to accidents, fragments of the functional ceramic part are blocked by the protective cover, the functional ceramic part is difficult to fall into liquid metal, and pipelines are blocked, so that the protective cover also provides certain protection for the tested equipment.
In one possible implementation of the present application, a gap is left between the inner wall of the protective cover and the outer wall of the functional ceramic part.
The embodiment of the application provides a liquid metal oxygen sensor, certain clearance makes the action of putting into the protection casing with the functional ceramic spare more convenient laborsaving, and the functional ceramic spare outer wall produces the friction with the protection casing inner wall hardly at this in-process to the integrality of functional ceramic spare has been guaranteed.
In a possible implementation of the application, the protective cover, the adapter housing and the functional ceramic part are connected by a transition piece by brazing.
The embodiment of the application provides a liquid metal oxygen sensor, because protection casing, adaptation shell, functional ceramic spare three are supported by different materials, and coefficient of expansion has the difference, and direct welding can lead to the linkage effect not good, consequently guarantees joint strength with the three difference welding on the transition piece, and suitable shape, convenient welding can be made to the connecting piece simultaneously.
In a possible implementation of this application, the transition piece includes cylindric base member, and the base member upper end an organic whole is provided with the flange, and base member inner wall and function ceramic spare outer wall connection, base member outer wall and protection casing inner wall connection, flange upside and adaptation shell lower extreme are connected.
The embodiment of the application provides a liquid metal oxygen sensor, and the wall thickness of base member can fill the clearance between protection casing and the functional ceramic spare, and the welding of being more convenient for sets up the flange, then has made things convenient for the welding of adaptation shell.
In one possible implementation of the present application, the protective cover and the adapter housing are both made of metal material, and serve as a negative electrode of the sensor, and the positive electrode is a functional element.
The embodiment of the application provides a liquid metal oxygen sensor, directly regards the protection casing as the electrode, avoids setting up too much electrode component, has simplified the structure of sensor, has saved the material.
In one possible implementation of the present application, the upper end of the adapter housing is provided with a seal.
The embodiment of the application provides a liquid metal oxygen sensor, the sensor needs different operational environment according to functional element's difference, need guarantee the leakproofness in the functional ceramic spare when adopting some functional element, because functional ceramic spare has with adaptation shell welded seal, its inner chamber is integrative, set up the sealing member in both all can, but the functional ceramic spare structure is comparatively fragile, be unsuitable for the installation sealing member, consequently, install the sealing member on the adaptation shell, improve the structural strength of sensor when guaranteeing functional element service environment, set up the sealing member at the tip simultaneously, be convenient for maintain more.
In one possible realization of the application, the functional ceramic piece has a smaller diameter at the lower end than at the upper end.
The embodiment of the application provides a liquid metal oxygen sensor, upper end major diameter, the wall thickness that corresponds is thicker, and the intensity of being connected with the adaptation shell is bigger, and the upper end is the bearing end of functional ceramic spare simultaneously, and the bearing capacity of major wall thickness is stronger, and lower extreme minor diameter, the wall thickness that corresponds is thinner, more does benefit to the oxygen ion and pierces through to shorten corresponding time.
In one possible realization of the application, there is a smooth transition between the lower end and the upper end of the functional ceramic part.
The embodiment of the application provides a liquid metal oxygen sensor, smooth transition helps the stress concentration of elimination to strengthen the intensity of functional ceramic spare, smooth transition has reduced the impact of liquid metal to functional ceramic pipe simultaneously, has promoted its anti-seismic performance, and the functional ceramic spare of smooth transition more does benefit to liquid metal and flows in the protection casing in addition, has also reduced the on-way resistance of liquid metal simultaneously.
In a second aspect, a method of manufacturing a liquid metal oxygen sensor, comprising: and fixing the lower end of the adaptive shell and the upper end of the functional ceramic piece, and installing the functional element into the functional ceramic piece.
The manufacturing method provided by the embodiment of the application is used for manufacturing the liquid metal oxygen sensor in any one of the first aspect, and the manufacturing method has few processes and is easy to implement. The liquid metal oxygen sensor manufactured by the method can solve the technical problems solved by any one of the liquid metal oxygen sensors in the first aspect, and achieves the same technical effects.
Drawings
FIG. 1 is a schematic sectional view of a liquid metal oxygen sensor provided in an embodiment of the present application;
FIG. 2 is a schematic view of a variable-diameter functional ceramic part of a liquid metal oxygen sensor according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a long cone type functional ceramic part of a liquid metal oxygen sensor according to an embodiment of the present disclosure;
fig. 4 is a schematic view of a fixing portion of a liquid metal oxygen sensor according to an embodiment of the present disclosure;
fig. 5 is a schematic view illustrating a connection between a fixing portion and an adapting housing of a liquid metal oxygen sensor according to an embodiment of the present disclosure;
FIG. 6 is a schematic view of a shield and an end cap of a liquid metal oxygen sensor according to an embodiment of the present disclosure;
FIG. 7 is a schematic view of a transition piece of a liquid metal oxygen sensor according to an embodiment of the present disclosure;
FIG. 8 is a schematic view of a seal of a liquid metal oxygen sensor according to an embodiment of the present disclosure;
fig. 9 is a schematic view of a support ring and an air hole of a liquid metal oxygen sensor according to an embodiment of the present disclosure.
Reference numerals are as follows:
1-a functional ceramic part; 11-tube wall; 12-an inner bore; 2-a functional element; 21-an inner electrode; 22-signal leads; 23-an insulating sleeve; 3-an adapted housing; 31-a stationary part; 4-a protective cover; 41-through holes; 42-end cap; 5-a transition piece; 51-a substrate; 52-a flange; 6-a seal; 61-a first seal ring; 62-a second seal ring; 7-a support ring; 71-air holes.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, specific technical solutions of the present application will be described in further detail below with reference to the accompanying drawings in the embodiments of the present application. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
In the embodiments of the present application, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of the present application, "a plurality" means two or more unless otherwise specified.
In addition, in the embodiments of the present application, directional terms such as "upper", "lower", "left", and "right" are defined with respect to the schematically-placed orientation of components in the drawings, and it is to be understood that these directional terms are relative concepts, which are used for descriptive and clarifying purposes, and may be changed accordingly according to changes in the orientation in which the components are placed in the drawings.
In the embodiments of the present application, unless otherwise explicitly specified or limited, the term "connected" is to be understood broadly, for example, "connected" may be a fixed connection, a detachable connection, or an integral body; may be directly connected or indirectly connected through an intermediate.
In the embodiments of the present application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
In the embodiments of the present application, the words "exemplary" or "such as" are used herein to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" or "such as" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present relevant concepts in a concrete fashion.
The embodiment of the application provides a liquid metal oxygen measurement sensor which is used for measuring the oxygen content in various types of nuclear reactor heat transmission loop systems with liquid metal as a coolant. The oxygen content measuring device mainly aims at various nuclear systems using metal lead, lead-bismuth alloy, sodium-potassium alloy, lithium, lead-lithium alloy and the like as cooling agents, such as cooling agents of a lead-bismuth reactor test bed, lead-bismuth reactors of various types, an Accelerator Drive System (ADS) and the like, and provides a powerful guarantee for the safe, stable and reliable operation of the devices and equipment.
Referring to fig. 1, the liquid metal oxygen sensor of the present application includes a functional ceramic part 1, wherein the functional ceramic part 1 is provided with an opening at the upper end and a closed lower end, and the lower end of the functional ceramic part 1 is used for extending into the liquid metal in the container to be measured.
It should be noted that the functional ceramic part 1 can have various shapes, and referring to fig. 1, in an embodiment of the present application, the functional ceramic part 1 is in a long tubular shape, and includes a tubular wall 11, a lower end of the tubular wall 11 is in a spherical structure, which is convenient for manufacturing, and has a large structural strength, an inner hole 12 is provided in the tubular wall 11, and the aperture of an upper portion of the spherical structure of the inner hole 12 is kept consistent.
In order to ensure the connection strength and shorten the response time, referring to fig. 1, in an embodiment of the present application, the diameter of the lower end outside the tube wall 11 of the functional ceramic part 1 is smaller than the diameter of the upper end, the diameter of the upper end is large, the wall thickness of the corresponding tube wall 11 is thicker, the strength of connection with the adaptive shell 3 is larger, the upper end is the bearing end of the functional ceramic part 1, the bearing capacity of the tube wall 11 with the large wall thickness is stronger, the diameter of the lower end is small, the corresponding wall thickness is thinner, and oxygen ions are more favorably penetrated, so that the response time is shortened.
In order to eliminate the stress concentration of the functional ceramic part 1, referring to fig. 2, in an embodiment of the present application, the functional ceramic part 1 is of a transition diameter-variable type, the smooth transition between the lower end and the upper end of the outer side of the pipe wall 11 of the functional ceramic part 1 helps to eliminate the stress concentration, thereby enhancing the strength of the functional ceramic part 1, and meanwhile, the smooth transition reduces the impact of the liquid metal on the functional ceramic pipe, thereby improving the anti-seismic performance of the functional ceramic pipe, and in addition, the functional ceramic part 1 in smooth transition is more beneficial to the flow of the liquid metal in the protective cover 4, and meanwhile, the on-way resistance of the liquid metal is also reduced.
In addition, referring to fig. 3, in another implementation manner of the present application, the functional ceramic part 1 is in a long cone shape, and the structure thereof can also ensure the structural strength while shortening the response time, and eliminate the stress concentration, thereby enhancing the strength of the functional ceramic part 1 and reducing the resistance to the liquid metal.
The functional ceramic part 1 is made of zirconium oxide doped with CSZ, YSZ, yb-SZ, sc-ZrO2 and the like, the doped raw materials are prepared into superfine powder, then the superfine powder raw materials are subjected to cold isostatic pressing to form a transition variable diameter type or long cone type shape, and then the shape is formed by heat preservation and sintering in a high-temperature furnace. The wall thickness of the functional ceramic part 1 is 1.0-3.0 mm, the length is 50-500 mm, the mol percentage of the functional ceramic part is 5-8% when Y2O3 is used for doping, the mol percentage of the functional ceramic part is 5-10% when Yb2O3 is used for doping, the mol percentage of the functional ceramic part is 12-16% when CaO is used for doping, and the mol percentage of the functional ceramic part is 10-15% when Sc2O3 is used for doping.
When raw materials or the shape of the functional ceramic part 1 is different, the manufacturing process is different, in one embodiment of the application, the functional ceramic part 1 adopts stable zirconia ultrafine powder doped with CaO in a molar percentage of 12.5% as a raw material, and is subjected to cold isostatic pressing forming, high-temperature furnace 1500 ℃, heat preservation for 2 hours, and sintering to prepare a 300mm long tapered zirconia tube, wherein the taper of the zirconia tube is 5 degrees, and the wall thickness is 1.5mm; in another embodiment of the application, the functional ceramic part 1 adopts stable zirconia ultrafine powder doped with Sc2O3 with the mole percentage of 12.5 percent as a raw material, and is prepared into a 200mm long conical zirconia tube through cold isostatic pressing, high-temperature furnace 1450 ℃, heat preservation for 2 hours and sintering, wherein the taper of the zirconia tube is 5 degrees, and the wall thickness is 1.5mm; in another embodiment of the application, stabilized zirconia ultrafine powder doped with CaO in a proportion of 12.5 mol% is used as a raw material, and a transition variable-diameter type doped stabilized zirconia element with the thickness of 3.0mm at the upper end and 1.0mm at the lower end is prepared by cold isostatic pressing, high-temperature furnace at 1500 ℃, heat preservation for 2h and sintering.
Referring to fig. 1, a functional ceramic part 1 is provided with a functional element 2 inside, the functional element 2 comprises an internal electrode 21, the internal electrode 21 is arranged at the bottom of the functional ceramic part 1 and is used as a positive electrode of a sensor, a signal lead 22 is fixed on the internal electrode 21, and the signal lead 22 is led out from an opening at the upper end of the functional ceramic part 1.
The material of the inner electrode 21 has various combinations, the first is Bi2O3 with the mass percent of 15-50%, and the rest is metal bismuth; the second is 5 to 50 mass percent of Y2O3, and the rest is metal indium; the third is platinum, and air is used as reference gas.
The signal lead 22 is made of different materials according to different selected inner electrodes 21, for example, molybdenum alloy wires with a diameter of 0.5-2.0 mm are selected as the material of the signal lead 22 correspondingly for the first and second inner electrodes 21; the third material of the inner electrode 21 is platinum wire with diameter of 0.5-2.0 mm as the material of the signal lead 22.
In an embodiment of the present application, 20% by mass of Bi2O3 is selected as the material of the inner electrode 21, the balance is metal bismuth, and a molybdenum alloy with a diameter of 1.0mm is selected as the signal lead 22; in another embodiment of the present application, the inner electrode 21 is made of platinum, and the signal lead 22 is made of platinum wire with a diameter of 0.6 mm; in another embodiment of the present application, the material of the inner electrode 21 is 20wt% of Y2O3, the balance is metal indium, and the diameter of the signal lead 22 is 1.0mm.
Because functional ceramic spare 1 can be because of stress concentration problem, can only sinter the tubular structure for a definite length, consequently the container that awaits measuring of the fixed degree of depth of adaptation only, can adapt to the container that awaits measuring of the different degree of depth for making the sensor, refer to fig. 1, in an embodiment of this application, the upper end of functional ceramic spare 1 is fixed with adaptation shell 3, adaptation shell 3 is long columnar structure, is equipped with fixed part 31 on the outer wall of adaptation shell 3, fixed part 31 is used for fixing the sensor on the container that awaits measuring.
Through at the fixed adaptation shell 3 in 1 upper end of functional ceramic spare to fixed part 31 on the adaptation shell 3 is fixed with the container that awaits measuring, because the length of adaptation shell 3 can freely set up, through the extension or shorten the 3 lengths of adaptation shells of position under the fixed part 31, thereby the extension or shorten the length that the sensor is located the container that awaits measuring, thereby the container that awaits measuring of adaptation different degree of depth has improved the universality of this application sensor, has richened its application scene.
In order to facilitate the fixing of the sensor on the tested container, the fixing portion 31 has various forms, referring to fig. 1 and 4, in an embodiment of the present application, the fixing portion 31 is a mounting flange, and a mounting hole is formed in the mounting flange for mounting, which has the advantages of simple structure, firm mounting and easy detachment.
The connection between the fixing portion 31 and the adapting housing 3 is various, and referring to fig. 1, in an embodiment of the present application, the fixing portion 31 and the adapting housing 3 are integrally formed, so that the manufacturing is convenient and the connection is firm. Referring to fig. 5, in another embodiment of the present application, the fixing portion 31 and the adapter housing 3 are connected by threads, and the threaded connection between the fixing portion 31 and the adapter housing 3 can achieve self-locking, and the threaded connection can adjust the relative position of the fixing portion 31 on the adapter housing 3, so as to relatively change the length of the adapter housing 3 below the fixing portion 31, thereby adjusting the length of the sensor in the measured container, and thus improving the flexibility of sensor adjustment.
In order to ensure the sealing performance and the connection strength of the sensor, referring to fig. 1, in an embodiment of the application, an adaptive shell 3 is in brazed connection with a functional ceramic part 1, the welding sealing performance is good, when a functional element 2 needing sealing is used, excellent sealing performance can be provided, additional parts are not needed, the structure is simple, and materials are saved; the welded structure has high rigidity and good integrity and is not easy to damage; meanwhile, when in brazing connection, the brazing filler metal is melted and flows through capillary force and fills the welding seam, and compared with the method for connecting the functional ceramic tube through fusion welding, the functional ceramic tube is almost free of deformation, and the structure of the functional ceramic tube is well maintained.
Wherein, need carry out gold group metallization to the upper end surface of functional ceramic spare 1 during the brazing connection to the welding improves welding strength simultaneously.
Since the functional ceramic element 1 is made of a hard and brittle material and is easily damaged by collision, in order to reduce the collision of the functional ceramic element 1, referring to fig. 1, in an embodiment of the present application, a protective cover 4 is connected to a lower end of the adapting housing 3, the protective cover 4 is sleeved on an outer side of the functional ceramic element 1, and a through hole 41 is formed in a position of the protective cover 4 opposite to the functional element 2.
The contact between the functional ceramic part 1 and the liquid metal is ensured by arranging the through hole 41, so that the protective cover 4 can not influence the detection of the sensor, the arrangement of the protective cover 4 avoids the direct collision of the functional ceramic part 1 with the outside, and the risk of damage to the functional ceramic part 1 is reduced in the processes of storage, transportation and use; meanwhile, in the installation process of the sensor, the installation can be rapidly and safely completed due to the protection of the protective cover 4, and the functional ceramic part 1 does not need to be collided with a measured container, so that the installation efficiency of the sensor is effectively improved; in addition, even if the functional ceramic part 1 is damaged due to accident, the fragments of the functional ceramic part are blocked by the protective cover 4, the functional ceramic part is difficult to fall into liquid metal, and pipelines are blocked, so that the protective cover 4 also provides certain protection for the tested equipment.
Referring to fig. 1 and 6, in an embodiment of the present application, an end cover 42 is disposed at a lower end of the protective cover 4, the end cover 42 may be integrally disposed with the protective cover 4, or detachably connected to the protective cover 4 by a thread, etc., the end cover 42 is also provided with a through hole 41, and the end cover 42 may be flat-bottomed, or may be set to be a hemispherical shape corresponding to a lower end profile of the functional ceramic element 1.
Among them, the shape of the through-hole 41 may be various, and exemplarily, a circular hole, a square hole, etc., and the number of the through-holes 41 is plural.
In order to put the functional ceramic element 1 into the protective cover 4, a gap is left between the inner wall of the protective cover 4 and the outer wall of the functional ceramic element 1. The action of putting the functional ceramic part 1 into the protective cover 4 is more convenient and labor-saving due to a certain clearance, and the outer wall of the functional ceramic part 1 hardly rubs with the inner wall of the protective cover 4 in the process, so that the integrity of the functional ceramic part 1 is ensured.
Because protection casing 4, adaptation shell 3, 1 three of functional ceramic spare are supported by different materials, and the expansion coefficient has the difference, and direct welding can lead to the joining effect not good, consequently, refer to figure 1, in an embodiment of this application, protection casing 4, adaptation shell 3, 1 three of functional ceramic spare are connected through 5 braze welding of a transition piece, guarantee joint strength with the three welding respectively on transition piece 5, and suitable shape can be made to the connecting piece simultaneously, makes things convenient for the welding.
Wherein, the material of the brazing connecting piece adopts kovar alloy, and the kovar alloy has relatively constant lower or middle expansion coefficient. The expansion coefficient of kovar alloy is close to that of sealed materials such as glass or ceramic, so that the effect of matched sealing is achieved, and the main types of the kovar alloy are iron-nickel, iron-nickel-cobalt, iron-nickel-chromium alloys and the like.
For the convenience of welding, referring to fig. 1 and 7, in an embodiment of the present application, the transition piece 5 includes a cylindrical base 51, a flange 52 is integrally provided at an upper end of the base 51, an inner wall of the base 51 is connected to an outer wall of the functional ceramic piece 1, an outer wall of the base 51 is connected to an inner wall of the protective cover 4, and an upper side of the flange 52 is connected to a lower end of the adapter housing 3. The wall thickness of the base body 51 can fill up the gap between the protective cover 4 and the functional ceramic part 1, so that welding is facilitated, and the flange 52 is arranged, so that welding of the adaptive shell 3 is facilitated.
In order to simplify the structure of the sensor and make the sensor easier to maintain, the protective cover 4 and the adapting shell 3 are both made of metal materials and used as the negative pole and the positive pole of the sensor are the functional elements 2. The protective cover 4 is directly used as an electrode, so that excessive electrode elements are avoided, the structure of the sensor is simplified, and materials are saved.
When the protection cover 4 is used as the negative electrode, the signal lead 22 needs to be insulated to avoid short circuit, and referring to fig. 8 and 9, in an embodiment of the present application, the signal lead 22 is covered with an insulating sleeve 23.
It should be noted that the material of the protection cover 4 and the material of the adapter housing 3 may be the same or different, and the materials may be various, and preferably, in an embodiment of the present application, the protection cover 4 and the adapter housing 3 are both made of stainless steel.
Since there are many kinds of inner electrodes 21 in the present application, such as bismuth trioxide/bismuth, indium trioxide/indium, etc., which are required to ensure the sealing property in the functional ceramic member 1, the upper end of the fitting housing 3 is provided with a sealing member 6. Because functional ceramic spare 1 has been sealed with the welding of adaptation shell 3, its inner chamber is integrative, set up sealing member 6 in both can, but functional ceramic spare 1 structure is comparatively fragile, unsuitable installation sealing member 6, consequently install sealing member 6 on adaptation shell 3, improve the structural strength of sensor when guaranteeing 2 service environment of functional element, set up sealing member 6 at the tip simultaneously, be convenient for more maintain.
Referring to fig. 8, in an embodiment of the present application, a first sealing ring 61 is disposed at an upper end of the adapting casing 3, a lower side of the first sealing ring 61 is clamped with the adapting casing 3, a second sealing ring 62 is clamped in the first sealing ring 61, the signal lead 22 and the insulating sleeve 23 penetrate through a center of the second sealing ring 62, and the signal lead 22 and the adapting casing 3 are hermetically connected through the first sealing ring 61 and the second sealing ring 62.
It should be noted that, when platinum is used as the inner electrode 21 and air is used as the reference gas, the functional ceramic element 1 and the adapting casing 3 are arranged in an open manner, referring to fig. 9, in an embodiment of the present application, the upper end of the adapting casing 3 is clamped with the support ring 7, the signal lead 22 passes through the support ring 7 and is supported by the support ring 7, the support ring 7 is provided with a plurality of air holes 71, and the air holes 71 communicate the inside and the outside of the functional ceramic element 1 to ensure that air is used as the reference gas.
It should be noted that the fixing of the two components refers to that the two components are fixedly connected, the form of the fixed connection may be various, and any way that the connected components do not move relative to each other may be adopted, such as welding, bonding, clamping, bolt connection, and the like.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments. The above description is only a preferred embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by the contents of the specification and the drawings of the present application, or which are directly or indirectly applied to other related technical fields, are included in the scope of the present application.
Claims (10)
1. A liquid metal oxygen sensor, comprising:
the outer wall of the adaptive shell is provided with a fixing part which is used for fixing on a container to be tested, and the part of the adaptive shell below the fixing part is positioned in the container to be tested;
the functional ceramic piece is fixed at the lower end of the adaptive shell, and a functional element for detection is arranged in the functional ceramic piece;
the protective cover is connected to the lower end of the adaptive shell and sleeved outside the functional ceramic piece;
the transition piece, the adaptation shell the function ceramic spare with the protection casing passes through transition piece fixed connection, the transition piece includes cylindric base member, the upper end an organic whole of base member is provided with the flange, the base member inner wall with function ceramic spare outer wall connection, the base member outer wall with protection casing inner wall connection, the flange upside with adaptation shell lower extreme is connected.
2. The liquid metal oxygen sensor of claim 1, wherein the adapter housing is brazed to the functional ceramic.
3. The liquid metal oxygen sensor of claim 1, wherein the shield is perforated at a location opposite the functional element.
4. The liquid metal oxygen sensor of claim 3, wherein a gap is left between the inner wall of the protective cover and the outer wall of the functional ceramic part.
5. The liquid metal oxygen sensor of claim 3, wherein the shield, the adapter housing, and the functional ceramic are joined by a transition piece.
6. The liquid metal oxygen sensor of claim 3, wherein the protective cover and the adaptive housing are made of metal material, and serve as a negative electrode and a positive electrode of the sensor, and the functional element.
7. The liquid metal oxygen sensor of claim 1, wherein said adapter housing is provided with a seal at an upper end thereof.
8. The liquid metal oxygen sensor of claim 1, wherein the functional ceramic piece has a lower end diameter smaller than an upper end diameter.
9. The liquid metal oxygen sensor of claim 8, wherein the functional ceramic element has a smooth transition between a lower end and an upper end.
10. A method of manufacturing a liquid metal oxygen sensor according to any one of claims 1 to 9, comprising:
fixing the lower end of the adaptive shell and the upper end of the functional ceramic piece;
and loading the functional element into the functional ceramic piece.
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